InsetsController: Add missing onWindowInsetsAnimationEnd when cancelling

Fixes a few issues around cancelling insets animations:

- dispatch the onEnd callback when the animation gets cancelled
- When using the CancellationSignal, we need to properly cancel the
  animation, and not just the controller - otherwise we never actually
  remove it from mRunningAnimations.
- Now that cancellation dispatches to apps, make sure they do not
  restart a different animation of the same type we just cancelled

Bug: 156740834
Test: atest WindowInsetsAnimationControllerTests
Change-Id: I4c36470a816ff8e3b92cd03090b8e947a2234f13